Combined cartridge filter and tube frame structure



FIG. 1 is a front elevational view of a combined cartridge filter and tube frame structure according to the present invention;

FIG. 2 is a side elevation view thereof, the opposite side being a mirror image of that shown;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a combined cartridge filter and tube frame structure, as shown and described. 